There are
2,012 mi
from St Charles, MO to Greenfield, CA
That's the driving distance. It would take 1 day 11 hours to go from St Charles, Missouri to Greenfield, California.
The flight distance (direct flight from St Charles, MO to Greenfield, CA) is 1,684.03 mi.
2,012 mi = 3,238.35 kms